STOP USING THEM IMMEDIATLY, Yellow Jumars are extremely unsafe which is why I only use blue ones personally. Sometimes I do see people using one yellow jumar, but its always backed up with a safe blue one.

I clip an oval (other shapes tend to corkfark the rope and cause extra friction) top and bottom on traverse.

I have the yellow jumars, really no need to sling them unless the frame is damaged, in which case you should toss them anyway. I have my very first pair of vintage grey "jumars-of-death", which I still use now and again. The greys have the old style frame which you HAD to sling them around the handle and down through the slot in the bottom of the frame. I believe the problem began with illiterate people who must not have been able to read the documentation, and would clip a biner directly through the slot in the bottom of the frame. Being pot metal, the thin sidewalls of the slot would snap when only minimal torque was applied to the frame by the biner. The problem was with the operator more so then the jumar itself, however the yellow style was definitely a big improvement. I also have a pair of pretzels, but prefer the jumars, especially when using them in any sort of rig. I have the rare z-toothed cams on the greys, which I was going to donate to Storrick, but he was such an arrogant dick in an email reply to me that I decided to keep them. The z-tooth relied pretty much on force alone to clamp the rope and was probably the easiest on ropes of all the handled ascenders, but... even a tiny bit of mud on rope would cause them to slip.. ice.. forget it.

I use the Yellow Jumars, they were hand me downs from Graig Peer and do the job nicely...I did re-sling them just in case though...I love them and wouldn't trade them for any of the newer designs, I still need to get a Croll/basic for a backup though...

STOP USING THEM IMMEDIATLY, Yellow Jumars are extremely unsafe which is why I only use blue ones personally. Sometimes I do see people using one yellow jumar, but its always backed up with a safe blue one.

Is this because of the acidic properties of Red Dye #5 that makes up the yellow paint? Man, why would anyone make those any more?